# std::chrono::year::ok

From cppreference.com
< cpp‎ | chrono‎ | year

constexpr bool ok() const noexcept; |  | (since C++20)

Checks if the year value stored in *this is in the valid range, i.e., `[`-32767`,` 32767`]`.

### Return value

true if the year value stored in *this is in the range `[`-32767`,` 32767`]`. Otherwise false.

### Possible implementation

See the implementations in libstdc++, libc++, and Howard Hinnant's date.h.

    class Year
    {
        short year_;   // exposition-only

    public:

        bool ok() const noexcept { return year_ != std::numeric_limits<short>::min(); }

        /*...*/
    };

### Example

Run this code

    #include <chrono>
    #include <iomanip>
    #include <iostream>

    int main()
    {
        std::cout << "input year │ internal value │ ok()\n" << std::boolalpha;

        for (const int i : {2020, 0x8000, 0x8001, 0xFFFF, 0x18000})
        {
            const std::chrono::year y{i};
            std::cout << std::setw(10) << i << " │ "
                      << std::setw(14) << static_cast<int>(y) << " │ "
                      << y.ok() << '\n';
        }
    }

Possible output:

    input year │ internal value │ ok()
          2020 │           2020 │ true
         32768 │         -32768 │ false
         32769 │         -32767 │ true
         65535 │             -1 │ true
         98304 │         -32768 │ false

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/year/ok&oldid=156895"